Bethalto Illinois Climate Data

Monthly Average Climate Data for Bethalto Illinois

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January22.7 °F38.6 °F2.61 in.
February26.1 °F44.0 °F2.35 in.
March34.9 °F54.2 °F3.38 in.
April45.6 °F65.9 °F4.82 in.
May56.5 °F75.2 °F5.18 in.
June65.4 °F83.9 °F4.52 in.
July69.0 °F86.8 °F4.15 in.
August67.0 °F86.0 °F3.77 in.
September58.6 °F80.1 °F3.22 in.
October47.0 °F68.3 °F3.31 in.
November36.0 °F54.4 °F3.52 in.
December27.3 °F43.3 °F2.67 in.
Annual46.3 °F65.1 °F43.5 in.

Climate Data for Bethalto Illinois

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 1 - Apr. 10
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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